Add a "Simplify Page" option to the print preview dialog

chrome/browser/printing/print_preview_dialog_controller.cc

Index: chrome/browser/printing/print_preview_dialog_controller.cc
diff --git a/chrome/browser/printing/print_preview_dialog_controller.cc b/chrome/browser/printing/print_preview_dialog_controller.cc
index 67e4faa47b7eef80a684213c9264f64f1ee37980..bd32d450c68a021c93b748018e719deb2a223f17 100644
--- a/chrome/browser/printing/print_preview_dialog_controller.cc
+++ b/chrome/browser/printing/print_preview_dialog_controller.cc
@@ -182,6 +182,14 @@ WebContents* PrintPreviewDialogController::GetOrCreatePreviewDialog(
 
 WebContents* PrintPreviewDialogController::GetPrintPreviewForContents(
     WebContents* contents) const {
+  // If this WebContents relies on another for its preview dialog, we
+  // need to act as if we are looking for the proxied content's dialog.
+  PrintPreviewDialogMap::const_iterator proxied =
+      proxied_dialog_map_.find(contents);
+  if (proxied != proxied_dialog_map_.end()) {
+    contents = const_cast<WebContents*>(proxied->second);

[Avi (use Gerrit), 2015/07/23 18:25:52]

From what I see, |proxied->second| is already a WebContents*. Why the cast?

+  }
+
   // |preview_dialog_map_| is keyed by the preview dialog, so if find()
   // succeeds, then |contents| is the preview dialog.
   PrintPreviewDialogMap::const_iterator it = preview_dialog_map_.find(contents);
@@ -374,6 +382,17 @@ WebContents* PrintPreviewDialogController::CreatePrintPreviewDialog(
   return preview_dialog;
 }
 
+void PrintPreviewDialogController::AddProxyDialogForWebContents(
+    WebContents* source,
+    WebContents* target) {
+  proxied_dialog_map_[source] = target;
+}
+
+void PrintPreviewDialogController::RemoveProxyDialogForWebContents(
+    WebContents* source) {
+  proxied_dialog_map_.erase(source);
+}
+
 void PrintPreviewDialogController::SaveInitiatorTitle(
     WebContents* preview_dialog) {
   WebContents* initiator = GetInitiator(preview_dialog);